<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区 -->
        <el-card>
            <!-- 头部的警告区域 -->
            <el-alert
                title="注意：只允许为第三级分类设置相关参数"
                type="warning"
                :closable="false"
                show-icon
            >
            </el-alert>
            <!-- 选择商品分区 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类：</span>
                    <!-- 选择商品分类的级联选择框 -->
                    <el-cascader
                        v-model="seletedCateKeys"
                        :options="cateList"
                        :props="cateProps"
                        @change="handleChange"
                    >
                    </el-cascader>
                </el-col>
            </el-row>

            <!-- tab页签区 -->
            <el-tabs v-model="activeName" @tab-click="handleTab">
                <!-- 添加动态参数的面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <!-- 添加参数按钮 -->
                    <el-button size="mini" type="primary" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染Tag标签 -->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                                <!-- 输入的文本框 -->
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index" label="#"></el-table-column>
                        <!-- 参数列 -->
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button icon="el-icon-edit" type="primary" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button icon="el-icon-delete" type="danger" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!-- 添加静态属性的面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <!-- 添加属性按钮 -->
                    <el-button size="mini" type="primary" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
                    <!-- 添加静态属性 -->
                    <el-table :data="onlyTableData" border stripe>
                        <!-- 展开行 -->
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染Tag标签 -->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                                <!-- 输入的文本框 -->
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index" label="#"></el-table-column>
                        <!-- 参数列 -->
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button icon="el-icon-edit" type="primary" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button icon="el-icon-delete" type="danger" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>
        <!-- 添加参数的对话框 -->
        <el-dialog
            :title="'添加'+titleText"
            :visible.sync="addDialogVisible"
            width="50%"
            @closed="addDialogClosed"
        >
            <!-- 添加参数的对话框 -->
            <el-form 
                ref="addformRef" 
                :model="addform" 
                label-width="100px"
                :rules="addformrules"
            >
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addform.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible= false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>
        <!-- 修改属性的对话框 -->
        <el-dialog
            :title="'添加'+titleText"
            :visible.sync="editDialogVisible"
            width="50%"
            @closed="editDialogClosed"
        >
            <!-- 修改参数的对话框 -->
            <el-form 
                ref="editformRef" 
                :model="editform" 
                label-width="100px"
                :rules="editformrules"
            >
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editform.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible= false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>
<script>
    export default{
        data(){
            return{
                cateList:[],
                // 级联选择框的配置对象
                cateProps:{
                    expandTrigger: 'hover',
                    value:'cat_id',
                    label:'cat_name',
                    children:'children'
                },
                // 级联选择宽双向绑定到的数组
                seletedCateKeys:[],
                // 被激活的页签的名称
                activeName:'many',
                // 动态参数的数据
                manyTableData:[],
                // 静态属性的数据
                onlyTableData:[],
                // 控制添加对话框的显示隐藏
                addDialogVisible:false,
                // 添加参数的表单数据对象
                addform:{},
                // 添加表单的验证规则对象
                addformrules:{
                    attr_name:[
                        {
                        required:true,
                        message:'请输入参数名称',
                        trigger:'blur'
                        }
                    ]
                },
                // 控制修改对话框的显示隐藏
                editDialogVisible:false,
                // 修改的表单数据对象
                editform:{},
                // 修改表单的验证规则
                editformrules:{
                    attr_name:[
                        {
                        required:true,
                        message:'请输入参数名称',
                        trigger:'blur'
                        }
                    ]
                },
            }
        },
        created(){
            this.getCateList()
        },
        methods:{
            // 获取所有的商品分类列表
            async getCateList(){
                const {data:res}=await this.$http('categories')
                if (res.meta.status!==200) {
                    return this.$message.error('获取商品分类失败')
                }
                this.cateList=res.data
            },
            // 级联选择框选中项变化，会触发这个函数
            handleChange(){
                this.getParamsData()
            },
            // tab页签点击事件的处理函数
            handleTab(){
                this.getParamsData()
                // console.log(this.activeName)
            },
            // 获取参数的列表数据
            async getParamsData(){
                // 根据所选分类的id，和当前所处的面板，获取对应的参数
                const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:this.activeName}})
                if (res.meta.status!==200) {
                    this.$message.errror('获取参数列表失败')
                }
                res.data.forEach(item => {
                    // 判断attr_vals是否为空，如果不为空才进行分割
                    item.attr_vals=item.attr_vals ? item.attr_vals.split(' ') : []
                    // 控制文本框的显示隐藏
                    item.inputVisible=false
                    // 文本框中输入的值
                    item.inputValue=''
                });
                console.log(res.data)
                if (this.activeName==='many') {
                    this.manyTableData=res.data
                }else{
                    this.onlyTableData=res.data
                }
            },
            // 监听添加对话框的关闭事件
            addDialogClosed(){
                this.$refs.addformRef.resetFields()
            },
            // 点击按钮添加参数
            async addParams(){
                this.$refs.addformRef.validate(valid=>{
                    if(!valid) return
                })
                const {data:res}=await this.$http.post(`categories/${this.cateId}/attributes`,{
                    attr_name:this.addform.attr_name,
                    attr_sel:this.activeName
                })

                if (res.meta.status!==201) {
                    return this.$message.error('添加消息失败')
                }
                this.$message.success('添加参数成功')
                this.addDialogVisible=false
                this.getParamsData()
            },
            // 点击按钮 展示修改对话框
            async showEditDialog(id){
                // 查询当前参数的信息
                const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes/${id}`,
                {params:{attr_sel:this.activeName}})
                if (res.meta.status!==200) {
                    return this.$message.error('获取参数信息失败')
                }
                this.editform=res.data
                this.editDialogVisible=true
            },
            // 重置修改的表单
            editDialogClosed(){
                this.$refs.editformRef.resetFields()
            },
            // 点击按钮修改参数信息
            editParams(){
                this.$refs.editformRef.validate(async valid=>{
                    if(!valid) return
                    const {data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${this.editform.attr_id}`,{
                    attr_name:this.editform.attr_name,
                    attr_sel:this.activeName
                    })
                if (res.meta.status!==200) {
                    return this.$message.error('修改参数失败')
                }
                this.$message.success('修改参数成功')
                this.getParamsData()
                this.editDialogVisible=false
                })
            },
            // 根据id删除对应的参数项
            async removeParams(attr_id){
                const confirmResult=await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
                    confirmButtonText: '确定',
                    cancelButtonText: '取消',
                    type: 'warning'
                }).catch(err=>err)
                // 用户取消了操作
                if(confirmResult!=='confirm'){
                    return this.$message.info('已取消删除')
                }
                // 删除的业务逻辑
                const {data:res}=await this.$http.delete(` categories/${this.cateId}/attributes/${attr_id}`)
                if (res.meta.status!==200) {
                    return this.$message.success('删除参数失败')
                }
                this.$message.success('删除参数成功')
                this.getParamsData()
            },
            // 文本框失去焦点，或按下了enter键都会触发
            async handleInputConfirm(row){
                if (row.inputValue.trim().length===0) {
                    row.inputValue=''
                    row.inputVisible=false
                    return
                }
                // 如果没有return，证明输入了内容，需要做后续处理
                row.attr_vals.push(row.inputValue.trim())
                row.inputValue=''
                row.inputVisible=false
                // 需要发起请求，保存此次操作
                this.saveAttrVals(row)
            },
            // 将对attr_vals的操作 保存到数据库
            async saveAttrVals(row){
                // 需要发起请求，保存此次操作
                const {data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
                attr_name:row.attr_name,
                attr_sel:row.attr_sel,
                attr_vals:row.attr_vals.join(' ')
                })
                if (res.meta.status!==200) {
                    return this.$message.error('修改参数项失败')
                }
                this.$message.success('修改参数项成功')

            },
                
            // 点击按钮，展示文本输入框
            showInput(row){
                row.inputVisible=true
                // 让文本框自动获得焦点
                // $nextTick方法的作用 就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
                this.$nextTick(_ => {
                    this.$refs.saveTagInput.$refs.input.focus();
                })
            },
            // 删除对应的参数和选项
            handleClose(i,row){
                row.attr_vals.splice(i,1)
                this.saveAttrVals(row)
            }
        },
        computed:{
            // 如果按钮需要被禁用 则返回true 否则返回false
            isBtnDisabled(){
                if(this.seletedCateKeys.length!==3){
                    return true
                }
                return false
            },
            // 当前选中的三级分类的ID
            cateId(){
                if(this.seletedCateKeys.length=3){
                    return this.seletedCateKeys[2]
                }
                return null
            },
            // 动态计算标题的文本
            titleText(){
                if (this.activeName==='many') {
                    return '动态参数'
                }
                return '静态属性'
            }
        }
    }
</script>
<style lang="less" scoped>
    .cat_opt{
        margin: 15px 0;
    }
    .el-tag{
        margin: 10px;
    }
    .input-new-tag{
        width: 120px;
    }
</style>
